DOC: configuration: add info about ssl-engine for 2.6

In the announcement of 2.6 is mentioned that the openssl engine
is not enabled by default.

This patch add the information to the configuration.txt.

This is related to GitHub Issue #1752.

Should be back ported to 2.6

diff --git a/doc/configuration.txt b/doc/configuration.txt
index 6313bc1b82778b8f057749ce2045b5e2d50ab268..ed8419055f3ce4672ef54ebb9411b0c1ac3cae8a 100644 (file)
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -2840,6 +2840,11 @@ ssl-engine <name> [algo <comma-separated list of algorithms>]
   openssl configuration file uses:
   https://www.openssl.org/docs/man1.0.2/apps/config.html
 
+  HAProxy Version 2.6 disabled the support for engines in the default build.
+  This option is only available when HAProxy has been built with support for
+  it.  In case the ssl-engine is required HAProxy can be rebuild with the
+  USE_ENGINE=1 flag.
+
 ssl-mode-async
   Adds SSL_MODE_ASYNC mode to the SSL context. This enables asynchronous TLS
   I/O operations if asynchronous capable SSL engines are used. The current